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a
N < C < P < S
b
C < N < S < P
c
C < N < P < S
d
N < C < S < P
answer is D.
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Detailed Solution
Atomic radius of C>NAtomic radius of P>SAtomic radius of P>N3rd period elements are larger than 2nd period elements if they belong to neighbouring groupthus P>S>C>N (or) N